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We see that Mr and Mrs Birling are more embarrassed at being found out for their thoughtless treatment of Eva Smith rather than regretting what happened to her as a consequence. Mr Birling is more concerned with losing his knighthood than a young girl losing her life. Mrs Birling appears not to believe that someone like Eva, a 'lower class' person, could even have feelings, let alone need them taking into account.
Mrs Birling thinks little of Eva and believes that she had "only herself to blame". Mrs Birling nrejeced Eva because she pretended to be called Mrs Birling and that struck Mrs Birling and increased her anger towards her